The MTX Digital Series “Dual Function” Vacuum/Boost & Shift Light (RPM.) is one gauge with TWO functions! That’s the perfect solution to help maximize limited space on your dash! The 2 1/16” (52mm) gauge features a water resistant casing, interchangeable faceplates and bezels, locking connectors for simplified installation, and MTS serial connections used to connect with other Innovate devices for logging.